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Old 01-29-2016, 02:36 PM
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Default RMZ250 bogging at low RMP... Help! I'm stumped

     

Hey guys,

I'm new to the game but excited to be here.

I just bought a '08 RMZ250. It bogs at low RPM's. Once you get passed the bogging (if you can) and get on it, it runs strong. If I leave the choke on, it will run okay at low RPM.

I don't know much about these things but I did clean the man jet and the pilot jet with no improvement.

Heres the strange thing- If I turn the carb about 30 degrees to the point where the pilot mixture screw is visible, it runs fine. I'm hoping that will help shed some light what is going on. Could it be a float issue and thats why turning it to the side helps somehow?

Any insight would be amazing. Thanks for the help!
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Old 02-16-2016, 06:50 PM
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First off welcome to ATM!

It certainly could be the float height and even if it's not, it's a great place to start troubleshooting.

The turning of the carb could fix the float? Your guess is as good as mine.

With the cooler temps here in Utah, you simply may need a richer pilot jet (a size or two bigger).

Both are good place to start. There is more you can try, but that's where I would start.
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Old 02-16-2016, 07:17 PM
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That sure sounds like a float level issue, but also keep in mind that having to run the choke is a sign of being lean without it. As stated go up on the pilot jet and or adjust the fuel screw under the carb float bowl at the front of the That needs to be adjusted daily as the weather changes. Turning the screw CCW makes it richer and CW makes it leaner. Go 1/8 of a turn at a time as this is a very sensitive adjustment. If those don't fix it then you will need to adjust the accelerator pump timing.

Paw Paw
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Old 02-17-2016, 12:50 AM
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How To Set Your Motorcycle Carburetor Float Level (more commentary).
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Old 02-17-2016, 10:17 PM
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I would check the fuel pump nozzle and make sure it isn't clogged. If it is shooting fuel then I would look to replacing the lip seal on the floating valve, this is part of the carb slide. The reason the bike runs with the carb twisted is you are compensating for either an air leak (Bad lip seal) or no accel pump fuel (plugged nozzle) with an extemely high float level. I have seen this more times than I can count. Switch to a non ethanol fuel if u haven't already.
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